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<?php $a = array(); $arrayKey = '[0][1]'; $a[0][1] = "two levels deep"; $vars = function($str) use ($vars) { return eval('return $vars'.$str.';'); }; echo $vars($arrayKey);
Output for 8.3.0 - 8.3.6
Warning: Undefined variable $vars in /in/c6Lrs on line 8 Warning: Trying to access array offset on null in /in/c6Lrs(10) : eval()'d code on line 1 Warning: Trying to access array offset on null in /in/c6Lrs(10) : eval()'d code on line 1
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Warning: Undefined variable $vars in /in/c6Lrs on line 8 Warning: Trying to access array offset on value of type null in /in/c6Lrs(10) : eval()'d code on line 1 Warning: Trying to access array offset on value of type null in /in/c6Lrs(10) : eval()'d code on line 1
Output for 7.4.0 - 7.4.33
Notice: Undefined variable: vars in /in/c6Lrs on line 8 Notice: Trying to access array offset on value of type null in /in/c6Lrs(10) : eval()'d code on line 1 Notice: Trying to access array offset on value of type null in /in/c6Lrs(10) : eval()'d code on line 1
Output for 7.3.32 - 7.3.33
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31
Notice: Undefined variable: vars in /in/c6Lrs on line 8
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/c6Lrs on line 8
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/c6Lrs on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/c6Lrs on line 8
Process exited with code 255.

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